/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jpxx.workflow.rule;

import java.util.HashMap;
import java.util.Map;

/**
 * <p>
 * operator is one of the following: ==, !=, <, >, <=, >=
 * </p>
 * 
 * @author John Lee
 * 
 */
public enum Operator {

	/**
	 * Equal
	 */
	EQ("=="),

	/**
	 * Non euqal
	 */
	NE("!="),

	/**
	 * Less than
	 */
	LT("<"),

	/**
	 * Greater than
	 */
	GT(">"),

	/**
	 * Less than or equal
	 */
	LE("<="),

	/**
	 * Greater than or equal
	 */
	GE(">=");

	private String operator;
	private static Map<String, Operator> map = new HashMap<String, Operator>();
	static {
		for (Operator op : Operator.values()) {
			map.put(op.getOperator(), op);
		}
	}

	private Operator(String operator) {
		this.operator = operator;
	}

	/**
	 * @return the operator
	 */
	public final String getOperator() {
		return operator;
	}

	/**
	 * 
	 * @param operator
	 * @return
	 */
	public static Operator getOperator(String operator) {
		return map.get(operator);
	}
}
